Personalized Presentation in Web-Based Information Systems

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Personalized Presentation in Web-Based Information SystemsInstitute of Informatics and Software Engineering Faculty of Informatics and Information Technologies Slovak University of Technology in BratislavaMichal Tvarožek, Michal Barla, Mária Bieliková

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Presentation outlineMotivation What is the problem? Personalized presentation layer architecture Evaluation Summary

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MotivationLarge open information spaces Navigation and search related problems “Lost in hyperspace” syndrome Many (irrelevant) search results  Adaptive WIS (web-based information systems) Few “standard” solutions New adaptive WIS = start from “square one”

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Adaptive WIS problemsNo standard software architecture available Used mostly for e-learning applications Existing reference models (Dexter, AHAM) Deal with mostly abstract stuff Ignore software development and reuse aspects HERA methodology focuses more on presentation than adaptation and user modeling

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User modeling problemsAutomatic creation of a user model is difficult Logging without semantics Hard-coded evaluation logic depends on a specific domain and implementation Web log analysis yields bad results Purely server-side approach Extensive pre-processing required Better suited for overall statistics gathering than the evaluation of individual users’ characteristics Sharing of user models between tools or applications requires common ground

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GoalsDevise the architecture of an adaptive WIS based on the use of interconnected software tools Identify tool roles and interconnects Focus on extensibility and flexibility Support architecture/tool reuse for different application domains Stress interoperability and “common ground” between tools

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Architecture overview

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PortalFacilitates user management tasks User registration User authentication and authorization Provides a single “global” user interface Ensures a common “look & feel” Integrates individual presentation tools as pluggable portlets that can be added, removed or reordered

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Architecture overview

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Presentation toolsPerform adaptive presentation of content Allow for the use of different views/perspectives suitable for individual users The same data can be viewed e.g. with a Faceted browser Cluster visualization tool Form-filling tool

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Architecture overview

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Client-side loggingCaptures client-side events that would otherwise go unnoticed Hovering on items Java script interaction “Back” button Form filling actions (e.g. the order of fields)

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Architecture overview

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Server-side loggingIntegrates event data from various sources Creates one continuous stream of events for Each user Each user session Preserves the semantics of events supplied by individual tools; Instead of GET www.x.com/overview.do?id=456&att=loc&r=33 We get: , (, ) Circumvents the tight coupling of presentation and log analysis tools in traditional approaches Makes the log data accessible to all user modeling tools

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Architecture overview

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User characteristics evaluationContinuously evaluates user event log data Estimates individual users’ characteristics Updates the user model Evaluates User navigation Implicit user feedback on presented content User behavior consistency or lack thereof

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EvaluationWithin the context of projects NAZOU (nazou.fiit.stuba.sk); domain: job offers Tools for Acquisition, Organization and Maintenance of Knowledge in an Environment of Heterogeneous Information Resources MAPEKUS (mapekus.fiit.stuba.sk); domain: scientific publications Modeling and Acquisition, Processing and Employing Knowledge About User Activities in the Internet Hyperspace Project constraints Implementation environment Java 5 Presentation framework Apache Cocoon Ontological repository Sesame

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How it works?

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What can we do with it?Personalize facet layout Improve response time Reduce the number of necessary clicks

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Key issues I.Interoperability and “common ground” between tools Requires common information and semantics representation  Ontologies provide means for defining common semantics Domain, user and event ontology Automatic user model acquisition Built-in comprehensive logging of user interaction with semantics Client-side Server-side Automatic event log evaluation Continuous user characteristics estimation

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Key issues II.Flexibility and extensibility Modular architecture composed of interconnected software tools Simultaneous support for the use and integration of multiple presentation/user modeling tools Reusability Generic domain independent tools for specific tasks

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SummaryGeneric architecture of the personalized presentation layer of adaptive WIS Evaluation within projects NAZOU (nazou.fiit.stuba.sk) ~ job offers MAPEKUS (mapekus.fiit.stuba.sk) ~ publications Future work Analyze possibilities of tool orchestration Devise methods of cooperation between multiple tools used for the same task

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Last Updated: 8th March 2018

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